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High-energy density lithium manganate positive electrode material and preparation method thereof

A density lithium manganate, cathode material technology, applied in manganate/permanganate, battery electrodes, electrical components, etc., can solve the problems of poor cycle performance, low compaction density, low gram capacity, etc. Improve tap density and compaction density, improve compaction density, increase the effect of gram capacity

Inactive Publication Date: 2020-06-02
陕西海恩新材料有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The second object of the present invention is to provide a high energy density lithium manganese oxide positive electrode material for the above-mentioned problems, by using a spherical or quasi-spherical trimanganese tetraoxide precursor and a specific metal oxide to finally obtain a high The energy density lithium manganate cathode material overcomes the problems of low gram capacity, low compaction density and poor cycle performance existing in the existing lithium manganate cathode materials

Method used

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  • High-energy density lithium manganate positive electrode material and preparation method thereof
  • High-energy density lithium manganate positive electrode material and preparation method thereof
  • High-energy density lithium manganate positive electrode material and preparation method thereof

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preparation example Construction

[0032] Such as figure 1 Shown, a kind of preparation method of lithium manganate cathode material of high energy density comprises the following steps:

[0033] S1. Mix lithium salt, trimanganese tetraoxide precursor, niobium oxide and yttrium oxide according to the designed ratio, then add ethanol solution and mix evenly to obtain mixed raw material A;

[0034]S2. Fully drying the mixed raw material A in a microwave dryer to obtain a dry mixed raw material B;

[0035] S3, placing the dry mixed raw material B in an orbital kiln for sintering to obtain a sintered product C;

[0036] S4. After jet crushing the sintered product C, a lithium manganate positive electrode material with high energy density is obtained.

[0037] Further, in order to better implement the present invention, in step S1, the mass percentage of each raw material is: lithium salt 22-32%, trimanganese tetraoxide precursor 62-81%, niobium oxide 1.6-2.5%, yttrium oxide 0.7% -1.4%, the sum of the total mass ...

Embodiment 1

[0045] A preparation method of high energy density lithium manganate cathode material, which comprises the following steps:

[0046] Step 1. Weigh the following raw materials: 0.427g of lithium carbonate, 1.54g of spherical or quasi-spherical manganese tetraoxide, 0.147g of niobium oxide, and 0.0327g of yttrium oxide;

[0047] Step 2. Add all the raw materials weighed in step 1 into the ball mill tank, add 1.07g of 50% alcohol and 50% high-purity water mixture (i.e. ethanol solution), the ball milling time is 3h, the ball milling speed is 1500r / min, and the mixed raw material A is obtained ;

[0048] Step 3. Place the mixture prepared in step 2 in a microwave dryer and dry it in microwave for 30 minutes to obtain dry mixed raw material B;

[0049] Step 4. Put the mixed raw material B prepared in step 3 into a tunnel kiln for sintering, the sintering atmosphere is oxygen, and the sintering conditions are: pre-firing temperature 540°C, heat preservation for 4 hours, then raise ...

Embodiment 2

[0058] A preparation method of high energy density lithium manganate cathode material, which comprises the following steps:

[0059] Step 1, 0.5245g of lithium carbonate, 2.02g of spherical or quasi-spherical trimanganese tetraoxide, 0.215g of niobium oxide, and 0.052g of yttrium oxide;

[0060] Step 2. Add all the raw materials weighed in step 1 into a ball mill tank, add 1.45g of 50% alcohol and 50% high-purity water mixture, the ball milling time is 2h, the ball milling speed is 1500r / min, and the mixed raw material A is obtained;

[0061] Step 3. Place the mixture prepared in step 2 in a microwave dryer and dry it in microwave for 30 minutes to obtain dry mixed raw material B;

[0062] Step 4. Put the mixed raw material B obtained in step 3 into a tunnel kiln for sintering, the sintering atmosphere is oxygen, and the sintering conditions are: pre-firing temperature 560°C, heat preservation 6h, then raise the temperature to 785°C, heat preservation 10h, wherein, the heating...

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Abstract

The invention discloses a high-energy density lithium manganate positive electrode material and a preparation method thereof. The method includes the steps of: S1, mixing a lithium salt, a trimanganese tetraoxide precursor, niobium oxide and yttrium oxide according to a designed proportion, then adding an ethanol solution, and mixing the substances uniformly to obtain a mixed raw material A; S2, fully drying the mixed raw material A in a microwave dryer to obtain a dried mixed raw material B; S3, sintering the dried mixed raw material B in an orbit kiln to obtain a sintered product C; and S4,carrying out air jet pulverization on the sintered product C to obtain the product. By using the spherical or spheroidal trimanganese tetraoxide precursor and the specific metal oxide, the high-energydensity lithium manganate positive electrode material is finally obtained, and the problems of low gram volume development, low compaction density, poor cycle performance and the like in existing lithium manganate positive electrode material are solved.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery preparation, in particular to a high energy density lithium manganate positive electrode material and a preparation method thereof. Background technique [0002] With the development of technology, lithium-ion batteries have very good application prospects in the fields of electric vehicles and energy storage, and will have a profound impact on people's lives in the future. The most widely used cathode material for lithium-ion batteries in commercial use is LiCoO 2 , but LiCoO 2 Poor safety, unfriendly to the environment, and, because the abundance of cobalt in the earth's crust is only 25ppm, resulting in LiCoO 2 expensive. [0003] Due to its cheap price, environmental friendliness and good safety, spinel-type lithium manganate is regarded as one of the most promising cathode materials. Spinel-type lithium manganate has a spinel structure, and the chemical formula of stoichiometr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/12H01M4/505H01M10/0525
CPCC01G45/12H01M4/505H01M10/0525C01P2002/32C01P2002/72C01P2004/03C01P2006/40Y02E60/10
Inventor 李伟徐丹军
Owner 陕西海恩新材料有限责任公司
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